She said: "But can I say, first of all being Jamaican, having been brought up in Jamaica, which is a multi-racial society... I'm very sorry, the baby's not going to be black.

"It's going to have black blood, but its also going to have white blood. You can't be seven-eighths white and called black. I think that is racism of the highest order."

Piers replied: "Really? That's interesting."

Lady Campbell carried on, dropping in a reference to the Nazi leader. She said: "Well that's rather like Hitler's definition of a Jew. I'm sorry, if you're one-eighth Jewish, you're completely Jewish and therefore, into the ovens.